You are 100% correct. My 6-7-minute articles seem to do the best. Consistency does pay off and taking this seriously as a job is the best way to see results.
I joined Medium back in the beginning. All I did was read the articles from time to time. I wrote a few but my interests were elsewhere.
Last year I heard someone say that if you wrote for Medium every day for a year, you'll pretty much have a regular income.
I never paid attention until this year. I took the challenge and made it a daily habit. My production is still not consistent, but there is already a difference in my appreciation for the platform.